ML19305E672
| ML19305E672 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/01/1980 |
| From: | Zech G Office of Nuclear Reactor Regulation |
| To: | Fraley R Advisory Committee on Reactor Safeguards |
| References | |
| NUDOCS 8005200250 | |
| Download: ML19305E672 (1) | |
Text
200E U 1
DISTRIBUTION:
Docket File 50-338/339 CSParrish NRC PDR I&E (3) d Local PDR Attorney, UELD i
MM 011580 NRR Reading
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@ (16) t ACRS LEngle ASchwencer WGammill Docket Hos. 50-338 DEisenhut and 50-339 RBosnak JKnight RMattson GZech MEMORNtDUM FOR:
R. F. Fraley, Executive Director Advisory Committee on Reactor Safeguards FROM:
Gary G. Zech, Technical Assistant Technical Support Branch, NRR
SUBJECT:
SEISMIC DESIGN 11ARGIN EVALUATION OF SYSTEMS AND EQUIPMENT REQUIRED FOR SAFE SHUTDOWN - !!0RTH NINA POWER STATION, UNITS 1 AND 2 (NA-l&2)
In its letter of January 17, 1977, to Chairman Rowden, and' in a supplemental letter of February 17, 1977, to B. C. Rus41e, the ACRS recommended that the NRC staff review the design of systems and equipment at NA-la2 required to achieve safe shutdown and continued shutdown heat removal following a seismic event.
The staff conducted a series of plant site visits and meetings with the Virginia Electric and Power Company (licensee) to discuss specific systems and equipment regarding this subject. Also in response to the ACRS request.;
for additional rtview,';the staff presented a summary of its findings to the full ACRS Cocnittee on March 9,1978. The staff findings concluded that the seismic design margin was adequate for the systems and equipment at NA-l&2.
However, during the March EU30 meeting the ACRS :. ambers raised further specific questions about seismic design margins.
By letter dated March 14, 1978, you requested the staff to prepare a report summarizing the seismic design margin evaluations for NA-l&2.
Although this repont to the ACRS was originally scheduled to be completed on l
November,1979, higner priority work during the past year has delayed the completi6niof this task.
By this memorandum, you are advised that we have contracted -a consultant (ORHL) to complett this work and the report is now scheduled for completion in December, i d J.
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Ofirinai Simed W Gary G. Zech. Technical Assistant Mgy f
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